Pushing the boundaries of traditional stand-up with an absurd mix of songs, sketches and even music videos, the nightclub act “The Naked Trucker & T-Bones Show” (9:30 p.m., Comedy Central) embarks on an eight-episode ride.

Dave Allen (“Freaks and Geeks”) plays the Naked Trucker, a frazzled old free spirit who drives his 18-wheeler wearing nothing but an old hat and cowboy boots and a strategically placed guitar.

T-Bones Tibbons (David Koechner) entered his life as a hitchhiker, and like a fly stuck to a windshield, he just won’t go away. Sporting dated sideburns and a vicious comb-over, T-Bones is a classic low-life trickster, a seemingly simpleminded freeloader who shows occasional glimpses of cunning – particularly when there is money, free food or booze involved.

Avoiding the trappings (and the expense) of producing a traditional sitcom, the two leads tell their story on-stage in front of a live audience, accompanied by a country roadhouse band. Their narration involves taped clips of their previous week’s activities.

Like a lot of unusual acts, one has to wonder whether “Naked Trucker” is more than one episode deep. But viewers looking for something a tad different should join this Trucker’s convoy.

¢ Tough love has a new name. Dr. Una Coales hosts the British series “Turn Back Your Body Clock” (8 p.m., BBC America). If this sounds like a touchy-feely show about drinking tea and doing yoga, think again.

In every episode, Coales confronts an overweight and out-of-shape Briton with a frank assessment of his or her health and diminished life expectancy. After a rigorous checkup and high-tech body scans, she delivers the bad news with harsh exactitude. Sometimes Coales sounds as though she’s auditioning to become the new host for “The Weakest Link.”

In the pilot, she tells a hefty salesman that his binge drinking and junk-food diet have turned him into a walking heart attack. She taunts him for his “man boobs” and shows him scans of his damaged heart and bloated liver.

Not to fear: Her subject swears off the bottle and undergoes a rigorous eight-week diet and exercise program. By the end of the half hour, he’s a lean and more virile man. He even gets a smile and hug from the stern Coales.

Don’t be surprised if you see an Americanized version of this series coming to a basic cable channel near you. It’s brutal but effective.

Tonight’s other highlights

¢ Locked and loaded on “Armed & Famous” (7 p.m., CBS).

¢ Homecoming day on “Friday Night Lights” (7 p.m., NBC).

¢ Auditions continue on “American Idol” (7 p.m., Fox).

¢ A serial killer changes spots to stay one step ahead of detection on “Criminal Minds” (8 p.m., CBS).

¢ Racing shopping carts can be murder on “CSI: NY” (9 p.m., CBS).

¢ Visions plague Allison during the search for a missing politician on “Medium” (9 p.m., NBC).

¢ Scheduled on “Primetime” (9 p.m., ABC): medical mysteries.